Pre/Post Increment
and Decrement

The
++ and -- operators are commonly used by programmers as shortcuts for
incrementing and decrementing variables. The following three
WMLScript statements are equivalent:

x
= x + 1;

++x;

x++;

If
the ++ operator is placed before a variable (e.g. ++x), we call this
pre-increment; if the ++ operator is placed after a variable (e.g.
x++), we call this post-increment. The following WMLScript examples
can help you understand the difference between them:

var
x = 100;var y = ++x;

After
execution, x has the value 101 while y has the value 101. x is
incremented first and then the result is assigned to y. The above
block of code is equivalent to:

var
x = 100;x = x + 1;var y = x;

Now
let's see an example of post-increment:

var
x = 100;var y = x++;

After
execution, x has the value 101 while y has the value 100. The initial
value of x (i.e. 100) is assigned to y first and then x is
incremented. The above block of code is equivalent to:

var
x = 100;var y = x;x = x + 1;

The
-- operator is used in a similar way. If the -- operator is placed
before a variable (e.g. --x), we call this pre-decrement; if the --
operator is placed after a variable (e.g. x--), we call this
post-decrement. Below is an example of pre-decrement:

var
x = 100;var y = --x;

After
execution, x has the value 99 while y has the value 99, since x is
decremented first before its value is assigned to y.

Below
is an example of post-decrement:

var
x = 100;var y = x--;

After
execution, x has the value 99 while y has the value 100, since the
initial value of x, i.e. 100, is assigned to y first. After that x is
decremented.

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